Know Your Environment. Protect Your Health.

Chromium (total)

CTWC - Shoreline Region-Guilford System

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

 

25

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND40ND
2020ND60ND
2021ND20ND
2022ND30ND
2023ND80ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EPA Maximum Contaminant
Level (MCL): 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-30CA11463IOCRND
2018-03-30CA11466IOC1ND
2019-01-30IOC1 200520057ND
2019-02-27IOCR 200523002ND
2019-06-24IOC1 200537625ND
2019-07-10IOC1 200539998ND
2020-01-20IOC1 200563509ND
2020-01-21IOC1 200563516ND
2020-01-28IOC1 200564212ND
2020-02-11IOC1 200565799ND
2020-02-11IOCR 200565797ND
2020-02-25IOC1 200567275ND
2021-09-30I300072093 300072096ND
2021-09-30R300072099 300072102ND
2022-08-15CM05636ND
2022-08-29CM17830ND
2022-08-29CM17831ND
2023-02-13CN41858ND
2023-02-13CN41859ND
2023-09-12CO95874ND
2023-09-12CO95875ND
2023-09-12CO95877ND
2023-10-12CP23629ND
2023-11-28CP55320ND
2023-11-29CP56434ND